Sir Keir Starmer has announced his resignation as Labour leader, setting the stage for Britain to have a record-breaking seventh prime minister within a decadeSir Keir Starmer (2024-26): The Labour leader served less than two years in power despite winning his party a huge mandate in the 2024 General Election.Rishi Sunak (2022-24): The former Conservative PM was in power for one year and 254 days, one of the shortest terms of the 20th century, before losing the 2024 General Election to Sir Keir Starmer.Liz Truss (2022): Ms Truss became the shortest-serving prime minister in UK history, resigning after just 45 days in office. She was dethroned by a backbench rebellion after a distastrous ‘mini-budget’.Boris Johnson (2019-2022): Mr Johnson served 3 years and 44 days as PM, but was forced to resign due to a succession of scandals, including lockdown parties in Downing Street during Covid.Theresa May (2016-2019): May’s premiership was consumed by the fallout from the Brexit vote, with her predecessor David Cameron (2010-2016) resigning after the UK voted to leave the EU. She resigned as PM after 3 years and 11 days, having failed to win the support of MPs for her deal to take the UK out.In fullKeir Starmer to Liz Truss: The UK’s six prime ministers over decade of political turmoil